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395 messages, Last post on Aug 29, 2007 at 7:27 AM
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Replying to: sebring95 (Jul 12, 2004 5:31 am)
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Replying to: djasonw (Jul 12, 2004 6:11 am) That's what would have to be determined. If it costs $1,000 to add this to a diesel, is there really benefits in the end? Maybe, maybe not as I stated above. Worst case, say I commute 300 days a year and am stuck idling 1/2 hour per day. I'd burn an extra 36 gallons per year. That'd take 15 years to recoup the savings, and according to John vehicles don't last half that long anyway, lol. Of course someone like myself, I drive 80-100 miles per day and rarely idle.
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Replying to: sebring95 (Jul 12, 2004 6:23 am) |
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Replying to: sebring95 (Jul 12, 2004 5:31 am) Your use of "little" is vague & misleading. It's like saying a small amount of poison will kill you less than a large amount. > Idling in neutral In the real world, people have the heater and lights and the radio on. And in commute traffic they typically crawl very very slowly, rather than just sitting at a dead stop. At a stoplight, shutting off the engine entirely will obviously save fuel. That "little" you elude to amounts to *MASSIVE* levels of waste when you multiple it times the over 500 MILLION vehicles currently on the road. JOHN |
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Replying to: john1701a (Jul 12, 2004 8:43 am) So you agree the auto stop/start will do very little for a diesel. A battery assist obviously would. Sitting at a dead stop, the diesel is already using much less fuel than a gas counterpart. While coasting the diesel is using zero fuel. Which leaves us with the question of whether or not an auto start/stop would make sense (or cents). That "little" you elude to amounts to *MASSIVE* levels of waste when you multiple it times the over 500 MILLION vehicles currently on the road. The vast majority of which are gasoline powered and chugging fuel at a rate greater than a diesel. Please stay on-topic. |
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Replying to: sebring95 (Jul 12, 2004 8:57 am) Huh? I've been talking about full hybrids all along. You know, the kind that drive using only electricity at times. I'm not the one that abruptly changed the topic to "auto stop/start", nor have I focused on idle only. In fact, you are the one that mentioned "gas counterpart". Please stay on-topic. JOHN |
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Replying to: sebring95 (Jul 12, 2004 5:31 am) So, do you agree that diesel will get less benefits by going hybrid? "I actually did some testing yesterday with my VAGCOM software. I logged and monitored rpms, speed, throttle demand, and fuel qty....but I'm trying to compare speeds vs fuel burn to see if there's a sweat spot in the TDI." Wouldn't it be awesome if a computer knows all those information about your car and optimize everything for you on-the-fly? That will save a lot of work for you, isn't it? Can you say, HSD? Dennis
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Replying to: sebring95 (Jul 12, 2004 8:57 am) Nope. Gas electric use zero fuel at dead idle stop. "While coasting the diesel is using zero fuel." Gas electric hybrids don't use more fuel than necessary at all situations. "The vast majority of which are gasoline powered and chugging fuel at a rate greater than a diesel. Please stay on-topic." Again, comparing diesel to gasoline cars(off topic). If you want to talk about diesel-electric hybrids, compare it with gas-electirc hybrids. "Which leaves us with the question of whether or not an auto start/stop would make sense (or cents). " I would say no because it depends on how long the idling period is. Since, it is unpredictable, it isn't a solution. Diesel in general is a very good application for trucks and buses that operate most of the days and nights. For passenger vehicles, gas-electric hybrids are a better solution. Dennis
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